Virgo Logbook

Reports 1-1 of 1

AdV-ISC (Commissioning up to first full interferometer lock)

mantovani, pinto, ruggi - 10:11 Thursday 25 July 2024 (64782)

New controller for NI etalon loop

this morning the new controller for the NI has been updated after having re-evaluated the plant for NI (see entry https://logbook.virgo-gw.eu/virgo/?r=64736 )

the new controller is

# Etalon North boost 02
ACL_FILTER_SET     Etalon_north_boost_02   1        35000   1   10
ACL_FILTER_ZEROS   Etalon_north_boost_02   2e-07   0
ACL_FILTER_ZEROS   Etalon_north_boost_02   2e-06   0.6
ACL_FILTER_POLES   Etalon_north_boost_02   0       0
ACL_FILTER_POLES   Etalon_north_boost_02   0        0
ACL_FILTER_POLES   Etalon_north_boost_02   1e-5    0

Moreover the down conditon for long unlocks (like this commissioning break) is not optimal and it is better to discharge the offset at least once a day.

Comments to this report:

mantovani - 15:19 Thursday 25 July 2024 (64786)

In any case I've decreased of a factor 10 the gain of the filter for the NI and WI down condition to reduce the effect (to be improved once we will be again in working condition).